<!DOCTYPE html>
<html lang="en">
  <head>
      <meta charset="UTF-8">
      <title>超链接去下划线</title>
    <!--
      1. decoration 修饰
      -->
    <style type="text/css">
      a {
        text-decoration: none;
      }
    </style>
  </head>

  <body>
    <a href="http://www.baidu.com">点击到百度</a>
  </body>
</html>